The Untzi Museoa is a Naval Museum located in the old mid- eighteenth century consulate tower house in the port of San Sebastian. The museum, which opened its doors in 1991, was designed to contribute to the conservation, the study, and the dissemination of Basque seafaring and naval history.

The two main floors of the museum, its own collection and hosts long staying temporary exhibitions. Its collection consists of more than 6,000 pieces which includes pieces such as prints, paintings, nautical charts, boats and objects of navigation.The temporary exhibitions have focused on single topics, chosen for its historic and cultural relevance. The top floor houses smaller exhibitions and educational workshops as well as a specialized library open to everyone interested in consulting their funds.